The following links and descriptions fall under the title of Critical Thinking Challenges

Grade Level
Title
Description
Possible Outcome Links
Website Link
1 to 12
Galileo Educational Network - Math Fair Problems
This site provides various problems, investigations, games and puzzles. Each puzzle contains the story information, downloadable PDF file and print capabilities. There are teacher pages arranged per strand to make finding problems related to concepts your teaching easy.
Various
http://www.galileo.org/math/puzzles.html
1 to 12
Galileo Educational Network - Math Investigations
Investigations from elementary to secondary that use real world situations, data, and researched sources.
Various
http://www.galileo.org/math/investigations.html
7 to 9
Exploring Algebra - Use it.
Interactive Game solving simple - medium difficulty equations.

http://tinyurl.com/ylyrgyp
7-9
Interactive Sites - Variety
Videos and interactive from Learn Alberta
Various
http://www.learnalberta.ca/content/mejhm/index.html?l=0